<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    {{ msg | addTip(','， 'p') }}
    {{ msg | addTip('!') }}
    {{ msg | addTip('|') }}
  </div>
  <script src="./vue.js"></script>
  <script>
    new Vue({
      el: '#app',
      data: {
        msg: '我是一个好人'
      },
      filters: {
        addTip(res, flag, num) {
          // split : 字符串切割成数组
          // join: 数组拼接成字符串
          return res.split('').join(flag)
        }
      }
    })
  </script>
</body>
</html>